Alright, so the 2012 Buick Regal GS isn’t the Americanized version of the 325-horsepower, all-wheel-drive Opel Insignia OPC we were once promised. Still, this sports sedan has a turbocharged and direct injected 2.0-liter four-cylinder engine that produces 255 horsepower and 295 pound-feet of torque,... 

Is the Buick Regal GS the most important “maybe” of the 2010 Detroit Auto Show? It’s been more than two decades since performance enthusiasts cared about Buick in any meaningful way. The car at that time was the now legendary Buick GNX. Even if the proposed Regal GS makes production...